Once upon a time, mailist <mailist at toolz.com> said: > Even if you did have an RS232 port on the box, the serial drivers > for CentOS 7 have > never worked correctly. I had an application using RS232 that > worked perfectly > under CentOS 6, and then worked intermittently under CentOS 7, and > failed miserably > on CentOS 8. The handwriting on the RedHat wall says, "nobody uses > RS232 anymore!" I've used serial ports just fine on CentOS 7 (haven't had a physical CentOS 8 system so far, so can't say there, but have used serial consoles on CentOS 8 VMs), as well as newer Fedora (similar but newer kernels). Are you sure you weren't doing something in an unsupported and/or undefined way that just happened to work on CentOS 6? -- Chris Adams <linux at cmadams.net>